Boat and kayak owners 10 March 2021

How far can rodents swim?

Biosecurity for Life Officer RSPB, Scotland

As a guide: Brown rats can swim better than black rats which can swim better than house mice. Mice, however, are high-risk stowaway invaders.
 At 50m all rodents can easily swim to an island, and will do so frequently.
 At 500m black rat will invade but the frequency of incursions may be low.
 At 500m brown rat could, in many circumstances, be expected to reach the island every year


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Resource Tags:

  • Island
  • rat
  • identification
  • prevention
  • barriers
  • tracking